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Energy efficiency with electronic motor control by Danfoss
21-03-2013, 07:12
Post: #1
Energy efficiency with electronic motor control by Danfoss
[Image: Frequencycontrolfan.jpg]

37 million tons of CO2 are saved every year by the 4 million Danfoss VLT® variable speed drives installed world-wide. This corresponds to the CO2 emissions from more than 19 million cars in Europe. However, 70-80% of new industrial electric motors are wasting energy by not using variable speed drives to control their energy use. The number is even higher for electric motors already installed.
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A variable speed drive (or frequency converter) controls electric motors via the power supply. This way the motors only run at precisely the speed necessary to obtain the desired effect. A huge amount of motors today are running at full speed when they are switched on, irrespective of the need, which wastes a lot of energy.

Danfoss variable speed drives are used in many different applications: in buildings, in industry and in public systems. In buildings the variable speed drives can typically save 40% of energy in pump and fan applications and the pay-back time is usually 1-2 years. Meanwhile in industry, variable speed drives typically save 15% of energy consumption. They are used for a variety of things, such as controlling huge cranes and conveyor belts or pumping waste water from the cities to water purifying plants.

Sources: Danfoss (2012); IMS Research (2008): ”The World Market for Low Voltage AC & DC Motor Drives 2009" and ”The World Market for AC Induction Motors 2008”; European Environment Agency (2012); UNSD’s “Millennium Development Goals Indicators” database (2012). Click the link below to see the sources.
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